Softbox lighting set



FIG. 1 is a top, back and right side perspective view of a softbox lighting set showing my new design;

FIG. 2 is a bottom, front and left side perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a back view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

The broken lines shown in the drawings depict portions of the softbox lighting set that form no part of the claimed design. 

CLAIM The ornamental design for a softbox lighting set, as shown and described. 